Variable-delivery pump for hydraulic transmission systems.



W. G. GIBBONS. VARIABLE DELIVERY PUMP FOR HYDRAULIC TRANSMISSION SYSTEMS.

APPLIOATION FILED 00T.12, 1911.

1,020,277, Patented Mar. 12, 1912.

4 SHEETS-SHEET 1.

WIT/VESSEs WR W. G. GIBBONS. VARIABLE DELIVERY PUMP FOR HYDRAULIC TRANSMISSION SYSTEMS.

APPLICATION FILED OUT. 12, 1911.

1,020,277, Patented Mar. 12, 1912. FIG. 4SHEIIT8-8HEBT 2. L/fl/lll/l/l/l/////////////(/ll/I/l/ll/ W/Tmsss E6 INYENToR m MW-Ma/MZW. W

.W. G. GIBBONS. VARIABLE DELIVERY PUMP ron HYDRAULIC TRANSMISSION SYSTEMS.

APPLIUATION FILED OUT 12, 1911. 1,020,277.

4 SHEETS-BBBET 3.

FIG. 3.

I/VYEIYTaQ Patented Mar. 12, 1912.

W. G. GIBBONS. VARIABLE DELIVERY PUMP FOB HYDRAULIC TRANSMISSION SYSTEMS.

APPLICATION FILED OUT. 12, 1911. 1,020,277.

I i 4 BHBBT8-SHBET 4. I

WITNESSES hq ZVYEVTOR Patented Mar. 12,1912.

I UNITE STATES PATENT OFFICE.

WILLIAM earzeonx einsons, or EDINBURGH, soo'rLANn.

VARIABLE-DELIVERY PUMP FOR HYDRAU I IC TRANSMISSION SYSTEMS.

Specification of Letters Patent.

Application filed October 12, 1911. Serial No. 654,356.

Patented Mar. 12, 1912.

new and useful Improvements in Variable- Delivery Pumps for H draulic Transmission Systems, and of wh1ch the following is the specification.

The invention relates to that type of hydraulic transmission system consisting of a mechanicall operated pump mechanism supplying uid variable in amount or in pressure to a receiving mechanism which may be a hydrauliti motor, ram, or other apparatus, and has for its object to provide an eflicient and simple combination of devices for varying the pump delivery-while in addition there may be provided means for maintaining a constant torque resist-- anoe in the drlving shaft with a varying pressure in the transmission system. This combination of devices consists essentially of two crank shafts arranged side b side, the first fixed in position and adapte to be operated b a prime-mover, the second movable ra ially to and from the first and driven by gearingtherefrom. The gearing between the two shafts is adapted to vary the angular osition of the shafts (and so the phases 0 the cranks on them) relatively the one to the other, and consists of a pinion upon each shaft with which there meshes an intermediate pinion. The intermediate pinion is carried upon radial links pivoted on the axes of the shafts-or by equivalent devices-and so is ke t in gear with them; the second and move le shaft being moved to and from the first shaft by the toggle- 40 link movements of the shaft carrying the pinions. The intermediate pinion is thus movable through an are around each shaft, and its movement through a given angle varies the relative angular positions one to the other of the two crank shafts twice that 150 that the invention and the mannerof erforming the same may b'eproperly un erstood there are hereunto appended four sheets of explanatory drawings showing three examples of the carrying outof the 5 invention-the first two examples illustra-.

tive of the first method, the third example of the second method.

Figure 1 Sheet 1, Fig. 2 Sheet 2, and Fig.

3 Sheet 3, show in plan in sectional front and in sectional side elevation, respectively, the first example; Fig. 4:, Sheet shows in somewhat diagrammatic elevation the second example. And Fig. 5 shows similarly the third example.

According to the example of the first method shown in Figs. 1 to 4, similar cranks A B upon two crank shafts A, B engage slotted crossheads A B which have upon them guide rods A, A, B, B slidin at their lower ends in bosses in fixed brac ets C, and at their upper ends similarly in brackets Cthe parts being in duplicate,

that is to say, there are two cranks A, two

cranks 13, two crossheads A two crossheads B", and so on (Fig. 2). Blocks D, E,

(two of each) engage slots in the outer.- ends df floating levers F which are pivoted at their centers upon the piston rods F of two pumps F The crank shaft A is driven throu h a pinion G on it gearing with a pinion on a shaft A coupled. to any convenient source of power. On the two crank shafts A, B, are similar pinions G, H, which both gear with an intermediate pinion J the shaft of which is connected by to lo links J with the two crank shafts A, pinion J is constrained at all times to re-' main in gear with the pinions G, H. The shaft Ais carried in fixed bearings, but the shaft B is carried in a block slldin in so that the V guides H Now, it is apparent that i the ginion J be moved down forcing the shaft laterally outward in its guides H by the toggle links J, the cranks A B Wlll be altered in phase one to another, and whereas if they move synchronously in the position shown in Fig. 1, so moving the floating levers F bodily upand down, the full stroke of the pumps F will be given, when a certain point is reached in the downward movel of sufficiently greater length than those in m9 the crossheads A as the crank shaft A, the cranks A of which operate those crossheads, does not move. The pinion J may be adjusted in position by hand, but preferably it is automatically adjusted in accordance with the variation in pressure in the system with this latter arrangement there is thus automatically maintained a constant torque resistance on the pump driving shaft not-' withstanding that the pressurein the transmission system varies. To this end the spindle of the pinion J is connected bylinks K with a lever K pivoted in a shaft in fixed brackets on which are two short levers K connected by links K with the piston rod K of ahydraulic cylinder K connected to the pump delivery by a pipe K and loaded by a spring K which rests upon a collar K on the piston rod K and is adjustably held by a stirrup K on rods K extending up from the cylinder K Thus, as the pressure in the pump delivery rises, the pis ton or ram in the cylinder K rises, compressing the spring and, through the links K K, and lever K moving the pinion so as to shorten the effective stroke of the pumps F The elements of the mechanism are more easily seen in that example diagrammatically illustrated in Fig. 4 which only diifers in that 'the cranksAi B are directly connected by connecting rods L, L (the latter indicated by-a chain line) with the floating lever F+the "crank shaft B being carried in plumber blocksL laterally sliding in guides (not shown). This example has the slight disadvantages of the effect of connectingrod angularity avoided by the slotted cross-. head devices of the first example. Again, the example shown in Fig. 5' difl'ers only-in themanner of pump operation. Here the second method is involved, and instead of there being onepump in each unit the stroke of which is varied, the pump unit consists of 'two pumps M,-M with common suction N and discharge P.- If the operating cranks A B be in similar phaseythen the um unit .will deliver to thefullicapacity o bot its members M, M If the cranks be in oppositev phase, the liquid they operate will merely pass from one pump member to the other without any passing to the delivery.

. And so for any intermediate position of the pranks precisely as in the first method. To

the second and third examples there is shown applied the device for automatically adjustingthe position of the pinion J, but the pinion in them equally as in the first example may be operated by any other convenient means.

' It is obvious that any convenientnumber of units (of which in. the first example there are shown two) may be combined in cooperation. i What I claim is Loader? 1. In hydraulic transmission gearing, pump mechanism, comprising two parallel crank shafts, gearing interconnecting said crank shafts, said gearing being constructed and arranged to. permit the relative positions of the cranks to be varied during operation, and a pump-unit operatively con nected to the cranks.

2. In hydraulic transmission gearing, pump mechanism comprising two parallel crank shafts, means for moving them radially the one to the other, a pinion on each shaft, a third and intermediate pinion gearing with both said pinions, means for keeping said intermediate pinion in gear, means for moving it relatively to the shaft pinions and operative connection between the crank and a pump unit.

3. In hydraulic ,transmissio n gearing,

shaft, a third and intermediate pinion gearing with both said pinions, means for keeping said intermediate pinion in gear, means for moving it relatively to the shaft pinions, connecting rods on the cranks and a pumpunit operatively connected thereto.

' 5. In hydraulic transmission gearing,

pump mechanism, comprising two parallel crank shafts, gearing interconnecting said crank shafts, said gearing being constructed and arranged to permit the relative positions of the cranks to be varied during operation, connecting rods on the cranks, a

floating lever to the ends of which said con necting rods are attached, and a pump unit operatively connectedtothe center of the floating lever.

6. In hydraulic transmission gearing, pum mechanism comprising two parallel crank shafts, means for moving them radi ally the one to the other, a pinion on each shaft, a third and intermediate pinion gear-- ing with both said pinions,-means for keeping said intermediate pinion in gear, means for moving itrelatively to the shaft pinions,

connecting rods on the cranks, a floating lever to the ends of which said connecting rods are attached, and a pump unit operatively connected to the center of the floating 1ever.. I a

7. In hydraulic ztransmisslon gearlng,

pump mechanism comprising two parallel crank shafts, means for moving them radi- :ally the one to the other, a pinion on' each shaft, a third and intermediatepinion gearing with both said pinions, means for keep- In testimony whereof I have signed my ing said intermediate pinion in gear, means name to this specification, in the presence of 10 011; novilig it iielaively to thedshafthpinions, two subscribing witnesses.

a y ran ic e in er connecte to t e um delivery, a lb aded ram therein, opei ativ e WILLIAM GREGORY- GIBBONS' connection between the ram and the means Witnesses:

for moving the pinion, and operative con- FINLAY DANmLB,

nection between the cranks and a pump unit. OLIVER RICHARD PAUL. 

